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Alkene triaryl phosphorane

This is an extremely useful reaction for the synthesis of alkenes. It involves the addition of a phosphonium ylid, e.g. (136), also known as a phosphorane, to the carbonyl group of an aldehyde or ketone the ylid is indeed a carbanion having an adjacent hetero atom. Such species are generated by the reaction of an alkyl halide, RR CHX (137), on a trialkyl- or triaryl-phosphine (138)—very often Ph3P—to yield a phosphonium salt (139), followed by abstraction of a proton from it by a very strong base, e.g. PhLi ... [Pg.233]

See other pages where Alkene triaryl phosphorane is mentioned: [Pg.2086]    [Pg.2098]    [Pg.2098]    [Pg.2153]    [Pg.2271]    [Pg.2359]    [Pg.2414]    [Pg.2414]    [Pg.2415]    [Pg.2534]    [Pg.2541]    [Pg.2569]    [Pg.90]    [Pg.2086]    [Pg.2086]    [Pg.2098]    [Pg.2098]    [Pg.2153]    [Pg.2153]    [Pg.2153]    [Pg.2271]    [Pg.2359]    [Pg.2374]    [Pg.2381]    [Pg.2414]    [Pg.2415]    [Pg.2534]    [Pg.2541]    [Pg.2569]    [Pg.2569]    [Pg.1071]    [Pg.1071]    [Pg.1229]    [Pg.2453]   
See also in sourсe #XX -- [ Pg.378 ]



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Phosphoran

Phosphorane

Triarylation

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